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Sigma PowerLED Downlight 

Installation and Operation Manual

Sigma 

Small

Sigma 

Large

Sigma

Surface-Mount

OVERVIEW

Imtra PowerLED fixtures are uniquely suited for marine, 

automotive and architectural lighting applications. They have 

been engineered specifically to take advantage of the latest LED 

(Light Emitting Diode) technology offering superior reliability, 

minimal power consumption and far less radiated heat than 

traditional incandescent light sources. When installed properly, 

these products will provide years of flawless performance.  

The Sigma series encompasses a common LSA (LED sub-

assembly) platform with different bezel options allowing the user 

to choose a model that can easily replace existing lights whether 

these are traditional halogen or older LED lights. The flush mount 

models are provided with stainless steel mounting springs which 

may be easily removed if a screw mount installation is required.

Sigma Small

 fits flush into a very common hole cutout size; may 

be either screw or spring mounted.

Sigma Large

 shares the same light engine but is equipped with a 

special adapter plate and larger diameter trim ring to fit a range

of larger hole cutout sizes; may be screw or spring mounted.

Sigma Surface-Mount

 shares the same light engine and features 

a sleek mounting bezel for installation where recessing is not 

possible.

Sigma is a 2-wire dimmable product that simplifies retrofit 

installations by allowing the installer to take advantage of the 

vessel’s existing two wires (or duplex cabling). Sigma is also 

compatible with some existing halogen dimmers which may 

further simplify installation and minimize the project’s wiring 

complexity. Sigma’s integrated low voltage AC bridge rectifier 

permits its use with either 10-40VDC or 12V/24VAC supplied by 

magnetic transformers.

SPECIFICATIONS

Sigma Small

Sigma Large

Sigma 

Surface-Mount

Trim Ring Diameter

3.57” (91mm)

4.35” (110mm)

3.57” (91mm)

Mounting Base Diam.

N/A

N/A

4.07” (103mm)

Bezel Height

0.34” (9mm)

0.34” (9mm)

1.25” (32mm)

Cutout Diameter

2.56” (65mm)

2.56” (65mm) to 

3.65” (93mm)

N/A

Recess Depth

0.90” (23mm)

0.90” (23mm)

N/A

Input Voltage Range

10-40V (AC/DC)

Power Consumption

5.0 Watts

IP Rating

IP65*

* IP65:  “Protected from the ingress of dust and low pressure jets of water from all directions”

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